Unit base



FIG. 1 is a top perspective view of a unit base showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top-exploded perspective view thereof;

FIG. 4 is a bottom-exploded perspective view thereof;

FIG. 5 is a front-exploded perspective view thereof, showing the planeupon which a cross-sectional view is taken and shown in FIG. 6;

FIG. 6 is a vertical cross-sectional view thereof taken along line 6-6of FIG. 5;

FIG. 7 is a front view thereof;

FIG. 8 is a back view thereof;

FIG. 9 is a top view thereof;

FIG. 10 is a bottom view thereof;

FIG. 11 is a left view thereof; and,

FIG. 12 is a right view thereof.

The broken lines showing of recessions in FIG. 2, FIG. 4-6, and FIG. 10and the broken lines showing of protrusions in FIG. 3-6 are included forthe purpose of showing environmental structure and forms no part of theclaimed design.

CLAIM The ornamental design for a unit base, as shown and described.